초록 ▼

A novel catalytic composite and a process of its use is disclosed. The catalyst comprises a platinum group metal component, a first modifier component selected from Group IA and IIA elements of the Periodic Table, a second modifier components selected from the group of elements consisting of palladi

A novel catalytic composite and a process of its use is disclosed. The catalyst comprises a platinum group metal component, a first modifier component selected from Group IA and IIA elements of the Periodic Table, a second modifier components selected from the group of elements consisting of palladium, iridum, and osmium, and a third modifier component selected from the elements of Group IVA of the Peridoic Table of the Elements. All of the catalytic components are located on a refractory oxide support having a nominal diameter (d) of from 50 to 1000 microns. The catalytic composite is characterized in that the second modifier component is surface-impregnated upon the support in such a manner that the average concentration of the surface-impregnated second modifier component on the outside 0.2d micron catalyst layer is at least 2 times the average concentration of the second modifier component in 0.4d micron diameter center core of the catalyst where d is the nominal diameter, and wherein the first modifier metal component is uniformly impregnated. The catalytic composite has been found to be most useful in the dehydrogenation of dehydrogenatable hydrocarbons.

대표청구항 ▼

A catalytic composite comprising platinum, a first catalytic modifier component selected from Group IA and IIA elements of the Periodic Table of the Elements or mixtures thereof, a second catalytic modifier component selected from the group iridium, osmium, or mixtures thereof, and a third catalytic

A catalytic composite comprising platinum, a first catalytic modifier component selected from Group IA and IIA elements of the Periodic Table of the Elements or mixtures thereof, a second catalytic modifier component selected from the group iridium, osmium, or mixtures thereof, and a third catalytic modifier component selected from one or more elements of Group IVA of the Periodic Table of the Elements, all on a refractory oxide support having a nominal diameter (d) of from 50 to 10000 microns, the catalytic composite characterized in that the second catalytic modifier component is surface-impregnated upon the catalytic composite such that the average concentration of the surface-impregnated second catalytic modifier component on the outside 0.2 d micron layer of the catalyst is at least 2 times the average concentration of the second catalytic modifier component in the 0.4 d micron diameter center core of the catalyst, and wherein the first modifier metal component is uniformly impregnated through the refractory oxide support.